—I’m sorry to have kept you ______ for such a long time.—It doesn’t matter.A. wait B. waiting C. to wait
-_______is the old bridge over the river? - Not very wide. It's about three meters.
We didn’t find________ in the picture.
- _______ exercising, and you'll be healthier.
----When did you _________ Suzhou last night? ----At about 9 p.m.
Are they ______ grandparents ?